Every time Firefox updates (which is pretty often, these days), it opens up a "Your Firefox Is Up to Date" page that, frankly, is a little annoying. Here's how to stop it from doing that next time it updates.

To turn off this annoying behavior for good, just type about:config in your address bar, hit enter, and promise Firefox you'll be careful. Then, search for:

browser.startup.homepage_override.mstone

Double click on it and set it to ignore. Now, whenever you update, Firefox should just open up your home page (or restore your session) as normal, without opening any new tabs that get in your way.